<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    body {
      background-color: black;
    }
    div.father{
      width: 200px;
      height: 200px;
      background-color: rgb(219, 68, 101);
      margin-left: 100px;
      margin-top: 100px;
    }
    div.father div.son{
      width: 100px;
      height: 100px;
      background-color: rgb(56, 248, 207);
      margin-left: 50px;
      margin-top: 500px;
    }
  </style>
</head>
<body>
  <div class="father">
    <div class="son">
      
    </div>
  </div>
</body>
</html>